Frank wickett



(N0 Mode l.)

I. WIOKETT 8: G. GpPFlN'GsTEN.

ARTIFICIAL LEG.-

No. 537,093. Patented Apr. 9, 1895.

Inver'z to r; KM Wm Witnesses NITED STATES PATENT OFFICE FRANK WIOKETT, OF BROOKLYN, AND CARL GUSTAV PFINGSTEN, OF I NEW YORK, 'N. Y.

. ARTIFICIAL LEG.

SPECIFICATION forming part of Letters Patent No. 537,093, dated April 9, 1895.

Application filed February 11, 1895- $erial No. 537.893- (N model.)

.To all whom it may concern.-

.Be it known that we, FRANK WIOKE'IJT, of Brooklyn, and CARL GUSTAV PFINGSTEN, of New York city, New York, have invented an Improved Artificial Leg, of which the following is a specification. 7

This invention relates to an artificial leg and more particularly to the constructionof the adjusting slide, by which the tension of the heel tendon may be regulated.

In the accompanying drawings: Figure 1 is a side elevation partly in section of our improved artificial leg. Fig. 2 is a rear view thereof. I

The letter (1, represents the body of an artificial leg, and b the foot connected thereto by the ankle joint as usual.

c, is the flexible heel tendon which is doubled and connected at its lower ends to the heel b, by nails or otherwise.

The upper loop of the tendon c, embraces a vertically movable slide d, having a grooved semi-circular upper edge into which the loop is laid. The slide (1, is supported by the upper end of a screw e, which engages the tapped socket of a base plate f. This base plate is firmly attached to the leg a, by rivets f that pass through the leg andalso through a clamp plate 9, which is placed against the inner side of the leg opposite to the plate f.

A collar 6', of the screw 6, is provided with peripheral sockets adapted to be engaged by a pin or key by which the screw may be revolved.

It will be seen that by revolving the screw, the slide (1, may be raised or lowered to increase or diminish the tension of the tendon 0. Thus any slack of the tendon occasioned by wear may be readily taken up and the proper tension may be easily restored.

The principal advantages connected with our construction are that the heel tendon is of increased strength, that it is not apt to twist by the motion of the slide, and that it is not exposed to increased strain at its point of attachment to the slide.

What we claim is The combination in an artificial leg of a slide having a curved and grooved periphery and supported by the upper end of a screw for operating the same with a doubled heel tendon which embraces the slide at its looped upper end and is connected to the foot at its lower ends, substantially as specified.

FRANK WIOKETT. CARL GUSTAV- PFIN GSTEN.

Witn esses:

WILLIAM SoHULz, F. v. BRIESEN. 

